Dynamics of State-Selected Ion/Surface Reactions

状态选择离子与固体表面相互作用的详细机理是分析和表面化学计划支持的这一研究项目的重点。圣母大学的丹尼斯·雅各布斯教授和他的同事们利用来自特征良好的表面的离子束的状态选择散射，以及对散射离子产物的状态特定检测，来确定离子-表面相互作用的微观机制。讨论了表面碰撞过程中电荷转移、离子碎裂和原子抽离的机制。氢分子离子与Al(111)碰撞的解离中和、HBr+与Si(100)表面的相互作用、NH3+与碱金属表面碰撞中的碱原子抽离是被选中研究的具体系统。这些研究的信息有助于理解反应离子刻蚀、大气离子化学和航天器动力学。为了全面了解离子与表面的相互作用，需要详细的特定状态的动力学信息。这项研究项目得到了分析和表面化学计划的支持，重点是获得这类信息。这项基础研究是在雅各布斯教授位于圣母大学的实验室进行的，研究了离子与表面碰撞时电荷交换、碎裂和原子抽离的微观机制。这些信息在从半导体加工到卫星动力学的各种应用中都很有用。

The detailed mechanism of the interaction of state-selected ions with solid surfaces is the focus of this research project supported by the Analytical and Surface Chemistry Program. Professor Dennis Jacobs and his colleagues at the University of Notre Dame use state-selected scattering of ion beams from well characterized surfaces, coupled with state-specific detection of the scattered ion products, to determine the microscopic mechanisms of ion-surface interactions. Mechanisms of charge transfer, ion fragmentation, and atom abstraction during the surface collision are addressed. The dissociative neutralization of hydrogen molecule ion colliding with Al(111), the interactions of HBr+ with the Si(100) surface, and alkali-atom abstraction in the collision of NH3+ with alkali dosed metal surfaces are the specific systems chosen for study. Information from these studies is useful in understanding reactive ion etching, atmospheric ion chemistry, and spacecraft dynamics.In order to develop a complete understanding of the interaction of ions with surfaces, detailed state specific dynamic information is needed. This research project, supported in the Analytical and Surface Chemistry Program, focusses on obtaining this sort of information. The fundamental research carried out in Professor Jacobs' laboratory at Notre Dame, addresses the microscopic mechanisms of charge exchange, fragmentation, and atom abstraction when ions collide with surfaces. This information is useful in applications ranging from semiconductor processing to sattelite dynamics.